Sensitive cookies not marked as secure

See more:

C#

ASP.NET

.NET

We have a Application which uses single sign on (SSO) for authentication
and need to Secure the Cookies ( Asp.net Session id and SSO Cookies).

I have enabled tag by adding <httpcookies requiressl="true"> in Web Config

When I run the application for the first time Both Cookies are Set as Secure and HTTP only.

But when I refresh the home page or click any subsequent pages SSO Cookies Secure flag is Missing.

Note : My Application uses HTTP and SSO uses HTTPS.

Please advise on this.

What I have tried:

I have cleared cookies and Rechecked again.
First time its working not after.